CVE-2026-67445

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-67445", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-29T15:07:24.992Z", "datePublished": "2026-08-20T21:13:27.481Z", "dateUpdated": "2026-08-21T21:45:36.467Z"}, "containers": {"cna": {"title": "Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/axllent/mailpit/security/advisories/GHSA-w878-pj84-3j5v", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w878-pj84-3j5v"}, {"name": "https://github.com/axllent/mailpit/commit/993bed95b3c74d95231af93bd0e0d4c3d5b4db4d", "tags": ["x_refsource_MISC"], "url": "https://github.com/axllent/mailpit/commit/993bed95b3c74d95231af93bd0e0d4c3d5b4db4d"}, {"name": "https://github.com/axllent/mailpit/releases/tag/v1.30.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.4"}], "affected": [{"vendor": "axllent", "product": "mailpit", "versions": [{"version": "< 1.30.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-20T21:13:27.481Z"}, "descriptions": [{"lang": "en", "value": "Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine() using bufio.Reader.ReadString before session.parseLine() parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticated remote SMTP client can send an oversized single command line that is fully allocated before syntax rejection or timeout, and the normal MaxMessageSize and DATA limits do not apply to this pre-DATA path. The same command reader is used by handleAuthLogin(), handleAuthPlain(), and handleAuthCramMD5() continuation lines, so concurrent oversized inputs can create memory pressure and reduce service availability. This issue is fixed in version 1.30.4."}], "source": {"advisory": "GHSA-w878-pj84-3j5v", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-21T21:09:33.233187Z", "id": "CVE-2026-67445", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-21T21:45:36.467Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection", "source": {"advisory": "GHSA-w878-pj84-3j5v", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "axllent", "product": "mailpit", "versions": [{"status": "affected", "version": "< 1.30.4"}]}], "references": [{"url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w878-pj84-3j5v", "name": "https://github.com/axllent/mailpit/security/advisories/GHSA-w878-pj84-3j5v", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/axllent/mailpit/commit/993bed95b3c74d95231af93bd0e0d4c3d5b4db4d", "name": "https://github.com/axllent/mailpit/commit/993bed95b3c74d95231af93bd0e0d4c3d5b4db4d", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/axllent/mailpit/releases/tag/v1.30.4", "name": "https://github.com/axllent/mailpit/releases/tag/v1.30.4", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine() using bufio.Reader.ReadString before session.parseLine() parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticated remote SMTP client can send an oversized single command line that is fully allocated before syntax rejection or timeout, and the normal MaxMessageSize and DATA limits do not apply to this pre-DATA path. The same command reader is used by handleAuthLogin(), handleAuthPlain(), and handleAuthCramMD5() continuation lines, so concurrent oversized inputs can create memory pressure and reduce service availability. This issue is fixed in version 1.30.4."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-400", "description": "CWE-400: Uncontrolled Resource Consumption"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-20T21:13:27.481Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-67445", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-21T21:09:33.233187Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-08-21T21:09:34.590Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-67445", "state": "PUBLISHED", "dateUpdated": "2026-08-20T21:13:27.481Z", "dateReserved": "2026-07-29T15:07:24.992Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-08-20T21:13:27.481Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "mailpit", "vendor": "axllent", "versions": [{"status": "affected", "version": "< 1.30.4"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine() using bufio.Reader.ReadString before session.parseLine() parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticated remote SMTP client can send an oversized single command line that is fully allocated before syntax rejection or timeout, and the normal MaxMessageSize and DATA limits do not apply to this pre-DATA path. The same command reader is used by handleAuthLogin(), handleAuthPlain(), and handleAuthCramMD5() continuation lines, so concurrent oversized inputs can create memory pressure and reduce service availability. This issue is fixed in version 1.30.4."}, {"lang": "es", "value": "Mailpit es una herramienta de prueba de correo electr\u00f3nico y API para desarrolladores. Antes de la versi\u00f3n 1.30.4, Mailpit lee comandos SMTP a trav\u00e9s de internal/smtpd/smtpd.go session.readLine() utilizando bufio.Reader.ReadString antes de que session.parseLine() analice el verbo o se aplique el l\u00edmite de l\u00ednea de comando de 512 octetos de RFC 5321. Un cliente SMTP remoto no autenticado puede enviar una \u00fanica l\u00ednea de comando de tama\u00f1o excesivo que se asigna completamente antes del rechazo de sintaxis o el tiempo de espera, y los l\u00edmites normales de MaxMessageSize y DATA no se aplican a esta ruta pre-DATA. El mismo lector de comandos es utilizado por las l\u00edneas de continuaci\u00f3n de handleAuthLogin(), handleAuthPlain() y handleAuthCramMD5(), por lo que las entradas concurrentes de tama\u00f1o excesivo pueden crear presi\u00f3n en la memoria y reducir la disponibilidad del servicio. Este problema se soluciona en la versi\u00f3n 1.30.4."}], "id": "CVE-2026-67445", "lastModified": "2026-10-18T20:10:00.110", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-67445", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-21T21:09:33.233187Z", "version": "2.0.3"}}]}, "published": "2026-08-20T21:17:07.110", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/axllent/mailpit/commit/993bed95b3c74d95231af93bd0e0d4c3d5b4db4d"}, {"source": "security-advisories@github.com", "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w878-pj84-3j5v"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.30.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "mailpit", "source": "cna", "vendor": "axllent"}, "product": "mailpit", "vendor": "axllent"}], "created": "2026-08-20T22:45:02.857730+00:00", "updated": "2026-08-21T01:00:04.537518+00:00", "vendors": ["axllent", "axllent$PRODUCT$mailpit"]}